Contact wafer



FIG. 1 is a top, front, and right side perspective view of a contact wafer showing our new design;

FIG. 2 is a bottom, back, and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left thereof;

FIG. 6 is a right view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof. 

CLAIM The ornamental design for contact wafer, as shown and described. 